CN113853035A - Device and method for improving temperature control precision - Google Patents
Device and method for improving temperature control precision Download PDFInfo
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- CN113853035A CN113853035A CN202111317747.6A CN202111317747A CN113853035A CN 113853035 A CN113853035 A CN 113853035A CN 202111317747 A CN202111317747 A CN 202111317747A CN 113853035 A CN113853035 A CN 113853035A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 79
- 230000017525 heat dissipation Effects 0.000 claims abstract description 27
- 238000009413 insulation Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000002609 medium Substances 0.000 description 42
- 238000005485 electric heating Methods 0.000 description 17
- 230000008859 change Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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Abstract
The invention discloses a device and a method for improving temperature control precision, which are characterized in that corresponding closed-loop control is added on the basis of open-loop control to perform heat dissipation loss heating compensation, dynamic balance of system heat is ensured, constant-temperature and constant-speed control is realized, and temperature control precision is improved; the heating plate comprises an open-loop control load and a closed-loop control load, the open-loop control load is connected with the open-loop control unit, the closed-loop control load is connected with the closed-loop control unit, and the controller is electrically connected with a power supply for supplying power to the device; or the heating plate only comprises one load, the load is respectively connected to the open-loop control unit and the closed-loop control unit, the open-loop control unit is electrically connected with the first power supply, and the closed-loop control unit is electrically connected with the second power supply.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a device and a method for improving temperature control precision.
Background
With the development of science and technology, automatic control systems are more and more widely applied, but how to realize higher-precision control through the prior art and devices is always the key of popularization and application of the automatic control systems. In real life, there are control systems for various physical quantities such as temperature, speed, concentration, etc., and in the most common temperature control, a controlled object includes various objects or a certain space, for example: an automatic temperature control system for heating water by an electric heating plate mainly comprises a temperature sensor, a heating load and a controller, wherein the temperature sensor provides detection data to the controller in real time, the controller sends an instruction to a control circuit after judging according to requirements, the resistance load of the heating wire is respectively in a heating stop state or a partial heating state by controlling the complete opening and closing action of the heating power supply or controlling the conduction angle, although the conduction angle control mode has higher control precision, the performance defects such as poor system stability and the like are easily caused by oscillation in engineering application, the direct on and off control of the power switch ensures a more stable system operation with technical advantages for more general applications, and is therefore discussed below in the direct on or off power control.
In fact, the temperature of the controlled liquid always fluctuates within a set range, such as: 80 +/-2 ℃, wherein 80 ℃ is a set temperature value, +/-2 ℃ is an allowable actual temperature fluctuation range of the system, namely control precision, the higher the control precision is, the smaller the fluctuation range is, the main reason of the fluctuation is just caused by the intermittent driving power supply on and off actions of the electric heating rod with higher power, the water medium heating is a typical hysteresis system, and the impact action caused by intermittent on and off of high current is added, for example: the steady current of a 500W electric cup reaches 2A. Therefore, the careful analysis of the specific control process and the load structure of the electric heating plate can help to realize the aim of improving the control precision of the system through the conversion of the control mode and the load structure under the condition of not increasing the cost of the system.
The temperature control system is generally divided into two types of constant temperature control and constant temperature rise control according to the required characteristics of application occasions: 1. the basic function of the thermostatic control system is to control the temperature of the liquid to a given temperature value on demand and then to keep it in a range of fluctuations around this temperature value during normal operation. The specific implementation process is generally realized by using a closed-loop control system, after the high-power electric heating disc is continuously heated to a set temperature such as 80 ℃ from room temperature at a set heating speed, the temperature sensor provides detection data to the controller in real time, the controller sends an instruction to the control circuit after judging according to requirements, and the electric heating disc is respectively in a heating stopping or heating state by controlling the complete opening or closing action of the heating power supply, so that the temperature of the controlled liquid is ensured to be always fluctuated within the range of 80 +/-2 ℃. If the water medium, the ambient temperature and the like in the system are generally in relatively stable states, the heated medium water is completely in an ideal state isolated from the outside heat at the moment, namely, no heat dissipation loss exists in the ideal state, and the system can be always in a constant temperature state without controlling intermittent heating action. In fact, the intermittent heating is needed to maintain a constant temperature under the controlled condition, because the heated medium in the system is not in a complete adiabatic state, but has heat dissipation loss phenomena with different degrees caused by different adiabatic modes; after the heating medium is continuously heated in an open-loop control state and rises to a set temperature, the intermittent heating process is continuously carried out through the opening and closing actions of the closed-loop control power supply, and the heat energy loss caused by various heat dissipations is compensated. 2. The constant-speed heating automatic control system has the basic function of continuously increasing the heated medium to a set value according to a preset heating speed and keeping a constant temperature state for a certain time or other requirements according to requirements. The specific implementation process is realized by a temperature closed-loop automatic control system at present, the water of the heated medium is directly heated by the electric heating disc, the temperature value of the heated medium is continuously provided for the controller in real time through the temperature sensor, and the controller sends a power-off or power-on instruction to the electric heating disc after comparing the set temperature value at the moment, so that the heating medium is ensured to rise according to the set temperature rise speed. Theoretically, the quantity and the heat capacity of the water medium are fixed for the stable constant-speed heating system device, and if the ideal condition that heat dissipation loss is caused along with temperature rise in the constant-speed temperature rise process is not considered, an open-loop control system can be theoretically completed, namely the water medium is heated by the electric heating plate with constant power in a continuous heating state. Such as: 1kg of water is heated from room temperature of 20 ℃ to 80 ℃, and the heating speed is as follows: 3 ℃/min; the required electric heating plate with the power of 143W is continuously heated. In fact, in a constant-speed heating system, the heat dissipation phenomenon becomes more and more obvious along with the temperature rise, and at the moment, the controller needs to control the load of the electric heating rod to provide more heat, so that the set value of the heating speed of the aqueous medium can be ensured. Theoretically, the constant-speed temperature rise of 2 ℃/min can be achieved by continuously heating the electric heating rod with 143W in an open-loop control mode without considering heat dissipation loss, heat dissipation loss is inevitable in practice, heat balance can be achieved only by continuously increasing supplementary heat with the increase of temperature rise and heat dissipation loss, and therefore heat dissipation compensation becomes a key factor influencing the accuracy of temperature control.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device and a method for improving temperature control precision, which divide the existing closed-loop control system into an open-loop control system and a closed-loop control system to realize the functions, namely, the heating compensation of heat dissipation loss is carried out by adding corresponding closed-loop control on the basis of the open-loop control, the dynamic balance of system heat is ensured, the constant-temperature and constant-speed control is realized, and the temperature control precision is improved.
In order to achieve the above object, the present invention provides a device for improving temperature control accuracy, comprising a container for carrying a medium, wherein a heating plate for heating the medium is arranged at the bottom of the container, the container is further provided with a temperature sensor for monitoring the temperature of the medium, the temperature sensor is communicatively connected to a controller, and the controller comprises an open-loop control unit and a closed-loop control unit;
the heating plate comprises an open-loop control load and a closed-loop control load, the open-loop control load is connected with the open-loop control unit, the closed-loop control load is connected with the closed-loop control unit, and the open-loop control unit and the closed-loop control unit are electrically connected with a power supply for supplying power to the device;
or, the heating plate only comprises one load, the load is respectively connected to the open-loop control unit and the closed-loop control unit in a control mode, the open-loop control unit is electrically connected with the first power supply, and the closed-loop control unit is electrically connected with the second power supply.
Further, the controller is connected with a stepping knob, and the stepping knob is in control connection with the open-loop control load.
Further, the open-loop control unit is connected with a gear shifting knob, and the gear shifting knob is connected with the load in a control mode.
Further, the open-loop control load, the closed-loop control load and the load are resistive loads of the heating wire type.
Further, the power of the open-loop control load is greater than the power of the closed-loop control load.
Further, the outside of the container is covered with an insulating layer.
Further, the upper part of the container is provided with an opening, and the opening is sealed and provided with a heat insulation cover.
Furthermore, a power socket for connecting a power supply is arranged on the heating plate.
Further, the power supply is a direct current power supply or a 220V alternating current power supply.
The invention also provides a method for adopting the device for improving the temperature control precision, which comprises the following steps: an open-loop control unit of the controller controls an open-loop control load in an open-loop control mode to set a heating speed to heat the medium, meanwhile, a temperature sensor monitors temperature information of the medium in real time and feeds the temperature information back to the controller, and after the controller receives the temperature information, the closed-loop control unit controls the closed-loop control load in a closed-loop control mode and enters a working state to perform heating compensation at the same time so as to enable the medium to be heated at a constant speed; after the heating medium reaches the set temperature, the open-loop control unit controls the closed-loop control load to be closed, the controller automatically switches to the working state of the closed-loop load, and the closed-loop control unit controls the closed-loop control load to continuously and discontinuously heat for heat dissipation compensation in a closed-loop control mode so as to keep the medium at a constant temperature;
or the open-loop control unit controls the first power supply to drive the load to set the heating speed to heat the medium, and the closed-loop control unit does not work at the moment; once the medium temperature reaches the set temperature, the open-loop control unit automatically turns off the first power supply, and simultaneously automatically switches to the closed-loop control unit to control the second power supply to drive the same load to continue to carry out heat dissipation compensation on the medium to keep constant temperature.
Compared with the prior art, the load of the heating plate is set into two parts in the first scheme of the device, one part is an open-loop control load with high power to realize a basic temperature rise function, and the other part is a closed-loop control load with low power to realize a compensation function of heat loss (which is a function of temperature or time) in a closed-loop control state, so that the energy balance of the system is achieved. In general, for a detection system in an instrument, good heat insulation and preservation measures can be realized, so that the closed-loop control load power for compensating heat dissipation loss is only about one fourth of the power of a single closed-loop control system, and the aims of reducing the fluctuation range caused by the change of the heating mode and improving the control precision are fulfilled. The principle of the instrument is similar to that one control knob in the instrument is divided into a coarse adjustment knob and a fine adjustment knob, and the coarse adjustment knob realizes the basic aim of temperature rise in an open-loop control mode; the fine adjustment knob completes high-precision automatic control through closed-loop control, the effect is very obvious when the fine adjustment knob is applied to a precision detection instrument according to the principle, the high heat insulation performance is easily ensured because the quantity of a heating medium in a system is small relatively, the power of a load in a closed-loop circuit is only one fourth or less than that of the load in the open-loop circuit, the current change range is reduced to be less than one half of the original current change range, the corresponding temperature fluctuation range is reduced to be less than one half of the original temperature change range, and the control precision is improved by at least two times.
The second scheme of the device of the invention is based on the fact that only one load is arranged under the condition that two loads cannot be simultaneously arranged due to objective condition limitation in many occasions, such as too small space in a detection instrument and the like, and two automatic control units are adopted to realize high-precision control on a constant temperature system, namely an open-loop control unit and a closed-loop control unit are respectively arranged, the loads are respectively connected with a first power supply and a second power supply, and the two temperature control units respectively and independently work in one working time period: the open-loop control unit works in a temperature rising stage, the closed-loop control unit works in a constant temperature stage, and the open-loop control unit automatically cuts off the first power supply to stop heating when heating the medium at a selected heating speed until the medium reaches a set temperature; meanwhile, the closed-loop control unit is automatically started to work, namely, the load is driven by the second power supply to convert electric energy into heat energy so as to supplement heat lost by heat dissipation formed by temperature difference, the temperature of the medium is kept basically constant, a switching value control mode is still adopted, and compared with a conventional closed-loop control system which always realizes constant temperature by driving the load by one power supply, the fluctuation range of the corresponding heating current of the control system is reduced to be less than half of the original fluctuation range, namely, the control precision is improved by more than one time.
The first method for improving the temperature control precision of the invention divides the prior load into two loads which are simultaneously arranged in the electric heating plate, divides the load which uniformly utilizes closed-loop control in the prior art into two loads which are respectively controlled by open-loop control and closed-loop control, and normally, the power of the closed-loop control load is far less than that of the open-loop control load, so that the impact amplitude of heating current caused by the on and off of a power control switch is sequentially and greatly reduced, the fluctuation range of the controlled temperature is also reduced, and the target of improving the control precision is obtained.
In the second method for improving the temperature control precision, the open-loop control unit heats the medium according to the selected heating speed, and automatically cuts off the first power supply to stop heating when the temperature reaches the set temperature; meanwhile, the closed-loop control unit is automatically started to work, namely, the load is driven by the second power supply to convert electric energy into heat energy, so that heat lost by heat dissipation formed by temperature difference is supplemented, the temperature of the medium is kept basically constant, the fluctuation range of the corresponding heating current is reduced to be less than half of the original fluctuation range, namely, the control precision is improved by more than one time, the constant-temperature and constant-speed control is realized, and the temperature control precision is improved.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the apparatus of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of a first embodiment of the apparatus of the present invention;
FIG. 3 is a schematic cross-sectional view of a second embodiment of the apparatus of the present invention;
wherein, 1 is an insulating cover, 2 is a container, 3 is an insulating layer, 4 is a medium, 5 is an electric heating disc, 6 is a power socket, 7 is a temperature sensor, 8 is an open-loop control load, 9 is a closed-loop control load, 10 is a controller, 11 is a stepping knob, and 12 is a load.
Detailed Description
The present invention will be further explained with reference to the drawings and specific examples in the specification, and it should be understood that the examples described are only a part of the examples of the present application, and not all examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The first embodiment is as follows:
the device comprises a container 2 for carrying a medium 4, a heating plate 5 for heating the medium 4 is arranged at the bottom of the container 2, the heating plate 5 comprises an open-loop control load 8 and a closed-loop control load 9, a controller 10 comprises an open-loop control unit and a closed-loop control unit, the open-loop control load 8 is connected with the open-loop control unit of the controller 10 through a stepping knob 11, the closed-loop control load 9 is connected with the closed-loop control unit of the controller 10, the container 2 is further provided with a temperature sensor 7 for monitoring the temperature of the medium 4, the temperature sensor 7 is in communication connection with the controller 10, and the controller 10 is electrically connected with a power supply for supplying power to the device. The open-loop control load 8 and the closed-loop control load 9 are both heating wires. The power of the open-loop control load 8 is greater than the power of the closed-loop control load 9. The exterior of the container 2 is covered with an insulating layer 3. The upper part of the container 2 is provided with an opening, and the opening is sealed and provided with a heat insulation cover 1. The heating plate 5 is provided with a power socket 6 for connecting a power supply. The power supply is a direct current power supply or a 220V alternating current power supply.
The embodiment of the invention also provides a temperature control method adopting the device, which comprises the following steps: in a constant-speed heating state, the open-loop control unit controls the open-loop control load 8 in an open-loop control mode through the grading knob 11 to heat the medium 4 at a selected set heating speed, meanwhile, the temperature sensor 7 monitors the temperature information of the medium 4 in real time and feeds the temperature information back to the controller 10, and the controller 10 receives the temperature information and controls the closed-loop control load 9 in a closed-loop control mode of the closed-loop control unit to perform heating compensation in an intermittent heating mode so as to heat the medium 4 at a constant speed; in a constant temperature state, after the heating medium 4 reaches a set temperature, the open-loop control unit controls to close the open-loop control load 8, and the closed-loop control unit of the controller 10 controls the closed-loop control load 9 to continue heating for heat dissipation compensation in a closed-loop control mode, so that the medium 4 keeps constant temperature.
The load of the electric heating disk 5 can be divided into two parts by a constant temperature system or a constant temperature raising system, one part is a high-power open-loop control load 8 to realize a basic temperature raising function, and the other part is a low-power closed-loop control load 9 to realize a compensation function of heat loss (which is a temperature or time function) under a closed-loop control state, so that the energy balance of the system is realized. The purpose of changing the heating mode in this way is to reduce the fluctuation range caused by the fluctuation range and achieve the aim of improving the control precision. The principle of the instrument is similar to that one control knob in the instrument is divided into a coarse adjustment knob and a fine adjustment knob, and the coarse adjustment knob realizes the basic purpose of temperature rise in an open-loop control mode; the fine adjustment knob completes high-precision automatic control through closed-loop control, the effect is very obvious when the fine adjustment knob is applied to a precision detection instrument according to the principle, the high heat insulation performance is easily ensured because the quantity of a heating medium in a system is small relatively, the power of a load in a closed-loop circuit is only one fourth or less than that of the load in the open-loop circuit, the current change range is reduced to be less than one half of the original current change range, the corresponding temperature fluctuation range is reduced to be less than one half of the original temperature change range, and the control precision is improved by at least two times.
The invention is realized by the transformation and matching of corresponding load structures, the load is divided into an open-loop control load 8 and a closed-loop control load 9 which are simultaneously arranged in the electric heating plate 5, the load which is originally and uniformly used for closed-loop control is divided into two paths of loads which are respectively controlled by an open-loop control Z1 and a closed-loop control Z2, and the load of the closed-loop control is far smaller than the load power of the open-loop control under the normal condition, so that the impact amplitude of heating current caused by the on and off of a power control switch is sequentially and greatly reduced, the fluctuation range of the controlled temperature is also reduced, and the aim of improving the control precision is achieved.
The following examples of the present invention are illustrated with constant temperature rise control and constant temperature control, respectively.
Constant-speed temperature rise control:
for a control system with a temperature rise rate of 3 ℃/min, the output power of the open-loop control load 8 at the time is 143W, so that a certain margin is left in the concrete implementation to prevent the temperature rise rate from exceeding a set value; as for the situation that the power supply voltage is too high due to the change of the operating condition, the situation can be compensated by the closed-loop control load 9, so the output power P1 of the open-loop control load 8 usually takes 85% of the calculated value thereof as the design parameter, and therefore the power of P1 is 143 × 85% — 120W; and the open-loop control mode is directly connected with a direct current or alternating current power supply. Theoretical calculation tests of the output power P2 of the closed-loop control load 9 prove that the heat dissipation loss compensation power at the maximum temperature of 100 ℃ is 45W, and in practice, 120% of the heat dissipation loss compensation power should be taken as a design value, i.e., P2 is 54W, so as to ensure that the compensation heat meets the requirement when the power supply voltage is lower than the rated voltage. In theory, when the closed-loop control load 9 is just heated in the room temperature environment, because there is no heat dissipation loss, the closed-loop control load is in an idle state in principle, and as the temperature rises, the heat dissipation loss increases, and the controller 10 sends a command to control the closed-loop control load to perform heating compensation on the heat loss. At the moment, the load structure of the system is added with a load compared with the original structure, different power selection is realized through the diameter and material selection of the electric heating wire, and the electric heating wire is still driven by the same power supply.
A temperature rise speed selection switch, namely a stepping knob 11, is additionally arranged in the open-loop control unit, the output power of the open-loop control Z1 is designed according to the highest temperature rise speed, then different temperature rise speeds can be selected according to actual requirements, real-time compensation of heat dissipation heat loss is completed by utilizing the closed-loop control Z2, and the output power of the closed-loop control Z2 needs to be correspondingly increased and adjusted at the moment, so that more functions and convenient operation are provided for users.
And (3) constant temperature control:
by utilizing the working principle and the load structure, the high-precision constant-temperature automatic control function can be easily realized. The specific implementation process is as follows: according to the requirement, firstly, a heating speed gear is manually selected through a stepping knob 11, and after a starting knob is started, the loads of an open loop and a closed loop are in a normal working state; after the heated aqueous medium is continuously and mainly heated by the open-loop control load 8 and rapidly rises to the set temperature, the open-loop control load 8 is closed, the controller 10 drives the closed-loop control load 9 to be continuously in a working state, the heat energy of heat dissipation loss in the temperature state is compensated, and the system is kept in a heat balance state all the time, namely, a constant temperature state.
Example two:
referring to fig. 3, the heating plate 5 only includes one load 12, the controller 10 includes an open-loop control unit and a closed-loop control unit, the load 12 is respectively controlled and connected to the open-loop control unit and the closed-loop control unit, the open-loop control unit is electrically connected to the first power supply, and the closed-loop control unit is electrically connected to the second power supply. The open-loop control unit is connected with a stepping knob 11, and the stepping knob 11 is connected with a load 12 in a control mode. The load 12 may be a load such as a heating wire. Other technical features are the same as those of the first embodiment, and the description is not repeated.
The temperature control method based on the second temperature control device comprises the following steps: in the temperature rising state, the open-loop control unit controls the first power supply to drive the load 12 to heat the medium 4 at a set temperature rising speed, and at the moment, the closed-loop control unit does not work, namely the second power supply does not work; in a constant temperature state, after the medium 4 is heated to a set temperature, the open-loop control unit controls the first power supply to be turned off, and the closed-loop control unit controls the second power supply to drive the load 12 to perform heat dissipation compensation.
In consideration of the fact that two loads cannot be simultaneously arranged due to objective condition limitations in many occasions, such as too small space in a detection instrument, the scheme of the second embodiment only sets one load 12, and adopts two automatic control units to realize high-precision control only for a constant temperature system, wherein the two automatic control units specifically comprise two parts, namely an open-loop control unit for directly selecting the heating speed manually through a stepping knob 11 and a closed-loop control unit for automatically maintaining the temperature, and specifically comprise two independent power supplies, a shared temperature sensor 7, the load 12 and a controller 10, as shown in fig. 3. The working period of the system is divided into two time periods of a temperature rising period and a temperature control period, and the two temperature control units respectively only independently work in one working time period: wherein the open-loop control unit works in a temperature rise stage, and the closed-loop control unit works in a constant temperature stage; and two different power supplies are provided. Such as: the 220v commercial power is used as a first power supply controlled by an open-loop control unit, a load 12 is directly driven to realize heating wire direct heating temperature rise with 143W power after a temperature rise speed gear is selected, the first power supply is automatically turned off after a set temperature is reached, meanwhile, a closed-loop control unit is automatically turned on to start working, the set power depends on factors such as heat insulation measures of a temperature rise device, and the like, and generally, in an instrument, because the volume is small and a heating medium is fixed, for example: 1 liter glycerol medium. Because a good heat preservation effect is easily achieved, the power of the closed-loop control unit is only one third or less of the power of the open-loop control unit, and here, taking 30W as an example, the second power supply may adopt ac or dc, and if taking a dc power supply as an example, the power supply voltage U thereof is230 (220) 220/143 (10154), and 100v (U). Under the drive of a 100v second power supply, the closed-loop control unit drives the load 12 to intermittently turn off or close according to the instruction, and the load 12 is driven to convert electric energy into heat energy to ensure effective compensation of load heat dissipation loss, so that the heat balance of the system is achieved.
If the control mode of the switching value is still adopted, and compared with the conventional closed-loop control system which always drives the load to realize constant temperature by one power supply, the corresponding heating current fluctuation range of the control system is reduced to below half of the original fluctuation range, namely, the control precision is improved by more than one time.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A device for improving temperature control accuracy, characterized by comprising a container (2) for carrying a medium (4), wherein a heating plate (5) for heating the medium (4) is arranged at the bottom of the container (2), the container (2) is provided with a temperature sensor (7) for monitoring the temperature of the medium (4), the temperature sensor (7) is communicatively connected to a controller (10), and the controller (10) comprises an open-loop control unit and a closed-loop control unit;
the heating plate (5) comprises an open-loop control load (8) and a closed-loop control load (9), the open-loop control load (8) is connected with the open-loop control unit, the closed-loop control load (9) is connected with the closed-loop control unit in a closed mode, and the open-loop control unit and the closed-loop control unit are electrically connected with the same power supply used for supplying power to the device;
or, the heating plate (5) comprises a load (12), the load (12) is respectively controlled and connected to the open-loop control unit and the closed-loop control unit, the open-loop control unit is electrically connected with a first power supply, and the closed-loop control unit is electrically connected with a second power supply.
2. The device for improving the accuracy of temperature control according to claim 1, wherein the controller (10) is connected with a stepping knob (11), and the stepping knob (11) is connected with the open-loop control load (8) in a control manner.
3. The device for improving accuracy of temperature control according to claim 1, wherein the open-loop control unit is connected with a step knob (11), and the step knob (11) is connected with the load (12) in a control manner.
4. An arrangement for improving accuracy of temperature control according to claim 1, characterized in that the open-loop control load (8), the closed-loop control load (9) and the load (12) are all resistive loads of the heating wire type.
5. An arrangement for improving accuracy of temperature control according to claim 1, characterized in that the power of the open-loop control load (8) is larger than the power of the closed-loop control load (9).
6. The device for improving the accuracy of temperature control according to claim 1, wherein the container (2) is covered with an insulating layer (3) on the outside.
7. The device for improving the accuracy of temperature control according to claim 1, wherein the upper part of the container (2) has an opening, and the opening is sealed with a heat insulation cover (1).
8. The device for improving temperature control accuracy is characterized in that the heating plate (5) is provided with a power socket (6) for connecting a power supply.
9. The apparatus of claim 1, wherein the power supply is a dc power supply or a 220V ac power supply.
10. A method of using the apparatus for improving temperature control accuracy of any one of claims 1 to 9, comprising: an open-loop control unit of the controller (10) controls an open-loop control load (8) to heat the medium (4) at a set temperature rise speed in an open-loop control mode, meanwhile, a temperature sensor (7) monitors temperature information of the medium (4) in real time and feeds the temperature information back to the controller (10), and after the controller (10) receives the temperature information, the closed-loop control unit controls a closed-loop control load (9) to perform heating compensation in a closed-loop control mode so as to enable the medium (4) to rise in temperature at a constant speed; after the medium (4) is heated to the set temperature, the open-loop control unit controls to close the open-loop control load (8), and the closed-loop control unit controls the closed-loop control load (9) to continue heating in a closed-loop control mode to perform heat dissipation compensation so as to keep the medium (4) at a constant temperature;
or the open-loop control unit controls the first power supply to drive the load (12) to heat the medium (4) at a set temperature rise speed, and the closed-loop control unit does not work at the moment; after the medium (4) is heated to a set temperature, the open-loop control unit automatically turns off the first power supply, and simultaneously, the closed-loop control unit is automatically turned on to control the second power supply to drive the load (12) to perform heat dissipation compensation and keep constant temperature.
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